Jim Bob was a pet slime owned by Ryley "Champwan" Wan. He found a very large slime inside the walls of his secret base while doing a house tour on his 42nd day. Champwan decided to keep one of the little ones, and named it Jim Bob with a name tag.
At first, Jim Bob was kept in a glass pane "cage", but Champwan moved him into a hidden room for the purge. After he moved out due to his secret base being found, he decided to move Jim Bob out of the base on his 57th day. However, Jim Bob drowned (R.I.P Jim Bob). Champwan named the two slime balls JimBob. He put one of them in a chest under Jim Bob's grave in his village, and the other one in a secret chest.